from flask import Flask, g, render_template
from flask_sqlalchemy import SQLAlchemy
from redis import StrictRedis
from flask_wtf.csrf import CSRFProtect,generate_csrf
from flask_session import Session
from config import config_dic
from logging.handlers import RotatingFileHandler
import logging

from info.utils.common import do_ranklist_class, get_user_info

db=SQLAlchemy()
redis_store=None

def write_log(config_class):

    # 设置日志的记录等级
    # DevelopmentConfig.LOG_LEVEL  == logging.DEBUG
    # ProductionConfig.LOG_LEVEL  == logging.ERROR
    logging.basicConfig(level=config_class.LOG_LEVEL)  # 调试debug级

    # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
    file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024 * 1024 * 100, backupCount=10)

    # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
    formatter = logging.Formatter('%(levelname)s %(filename)s:%(lineno)d %(message)s')

    # 为刚创建的日志记录器设置日志记录格式
    file_log_handler.setFormatter(formatter)

    # 为全局的日志工具对象（flask app使用的）添加日志记录器
    logging.getLogger().addHandler(file_log_handler)


def create_app():
    app=Flask(__name__)
    config_class=config_dic['development']
    write_log(config_class)
    app.config.from_object(config_class)
    db.init_app(app)
    global redis_store
    redis_store=StrictRedis(host=config_class.REDIS_HOST,port=config_class.REDIS_PORT,decode_responses=True)
    Session(app)
    CSRFProtect(app)
    # 勾子函数实现csrf_token的设置


    @app.after_request
    def set_csrf_token(response):
        csrf_token = generate_csrf()
        response.set_cookie('csrf_token',csrf_token)
        return response


    @app.errorhandler(404)
    @get_user_info
    def handler_404notfound(err):
        user=g.user
        data={
            "user_info": user.to_dict() if user else None
        }
        return render_template("news/404.html", data=data)

    app.add_template_filter(do_ranklist_class,'ranklist_class')
    # 注册蓝图对象
    from info.modules.index import index_bp
    app.register_blueprint(index_bp)

    from info.modules.passport import passport_bp
    app.register_blueprint(passport_bp)

    from info.modules.news import news_bp
    app.register_blueprint(news_bp)

    from info.modules.profile import profile_bp
    app.register_blueprint(profile_bp)

    return app